I'd check your probe calibration. Maybe your test kit is giving a false reading and your probe is calibrated to an incorrect set point. If your using a calibration solution, make sure that it is temperature adjusted. Clean the probe before calibrating, but let it readjust to the tank water for a day or so first.
Try testing a cup of water outside of the tank. Perhaps there is interference, from stray voltages or other probes.
I think with some controllers, the temperature probe acts as a ground. Try moving the Ph probe closer or further from the temp probe.
Take your test kit to a LFS and test their water. See if they get the same result with their probe or test kit. I had a similar problem and when I replaced my controller the new Ph measurements were much closer to where I wanted them to be. Lots of testing later, I decided it was accurate.
What you reay don't want to is to increase your Ph to 9.0 because your reading was out by .5
- Brad
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12-31-2010, 05:26 PM
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